A useful form of nitrogen is made available to plants through their

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Nitrogen is absorbed by roots in the form of nitrate or ammonium ions, which are then used by plants to make proteins and other necessary compounds. While some nitrogen can be absorbed through leaves, it is a relatively small amount and not as significant as nitrogen absorbed through roots. Stomata are pores on the leaves that allow gas exchange, but do not play a direct role in nitrogen uptake by plants.

A Useful Form of Nitrogen Is Made Available to Plants